[ 1195.156209][T10969] Could not find device with ifindex 2000 in netnsfd 11
[ 1195.157267][T10969] Could not find netns with fd: 2000
[ 1195.158149][T10969] Cannot link a netdevsim to itself
[ 1195.159279][T10969] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).